table {
    border-collapse: collapse;
    margin: 0 auto;
    width: 40%;
}
th, td {
    border: 2px solid greenyellow;
}
h3 {
    text-align: center;
}
p {
    text-indent: 2em;
}
#nav {
    background-color: #23fff8;
    line-height: 32px;
    height: 32px;
    text-align: left;
    margin-bottom: 20px;
    padding-right: 10px;
}
div.c1 {
    background: #77d664;
    display: inline-block;
    width: 33.3%;
    height: 320px;
     }
div.c2 {
    background: #a4ba57;
    display: inline-block;

    width: 66%;
    height: 300px;
}
.c3 {
width: 500px;
    height: 400px;
/*background-color: yellow;*/
    float: left;
}
.c4 {
    /*background-color: #dfdfe5;*/
    margin-left: 500px;
    height: 400px;
}